Merge pull request #29775 from yui-knk/assign_once

Assign `content_type` only once

actionpack/lib/action_controller/metal/data_streaming.rb

@@ -111,10 +111,10 @@ module ActionController #:nodoc:
       def send_file_headers!(options)
         type_provided = options.has_key?(:type)
 
-        self.content_type = DEFAULT_SEND_FILE_TYPE
+        content_type = options.fetch(:type, DEFAULT_SEND_FILE_TYPE)
+        self.content_type = content_type
         response.sending_file = true
 
-        content_type = options.fetch(:type, DEFAULT_SEND_FILE_TYPE)
         raise ArgumentError, ":type option required" if content_type.nil?
 
         if content_type.is_a?(Symbol)